In asymmetric warfare the focus is often about irregular warfare and little about regular warfare. This study focuses on asymmetric regular warfare and Arreguín-Tofts theory about how the weak win wars. His theory has a hypothesis that in asymmetric wars, with direct methods, the strong actor would win directly and decisive over the weak actor. The purpose of this study is to examine if combat engineering can provide the weak defensive actor with time. The study uses case study of the Swedish definition of combat engineering, to examine if it did occur during the Winter War. And if combat engineering did, had it any effect on the results of the Winter War. The overwhelming purpose of this study is to contribute to a discourse about combat support. Also illustrate that combat engineering is not always an established determinant, despite its effect in the results of war. The findings of the study are that combat engineering did occur during the Winter War. Combat engineering did provide the Finnish soldier with protection against artillery fire and delayed the attack of the Soviets tanks during the winter war.